I was wondering if you could advise me on how to clean my plaster ceiling. It is very delicate and I have tried sweeping it, dusting with a soft cloth but that just causes the meringue like pieces to break off. Is there anyway I can get the grit and grime off of this lovely ceiling without destroying it? I have looked all over the internet, but all I can find is out to remove it. Any information would be greatly appreciated and I have attached photos so you have an idea of what I'm dealing with.

Thank you.

Suzanne Marshall